Hardness tester



FIG. 1 is a perspective view of the hardness tester of this invention;

FIG. 2 is a front view of the hardness tester of this invention;

FIG. 3 is a left side view of the hardness tester of this invention;

FIG. 4 is a right side view of the hardness tester of this invention;

FIG. 5 is a top view of the hardness tester of this invention; and,

FIG. 6 is a bottom view of the hardness tester of this invention.

The rear view of the hardness tester of this invention does not form an ornamental aspect of the design of this hardness tester.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a hardness tester, as shown and described. 